I want to make a bot to suicide on to make a lot of side cash. But, woodcutting seems to suck, mining is always packed to the max, seems like only combat scripts make any money.
If you run multiple accounts, along with selling the 99 mining accounts, it can be quite profitable. There isn't a bot that is going to make you 50m/day, especially if you're just skilling the entire time.
With a low ban rate and then profit from the accounts, I'd say that's actually quite worth it. It takes zero effort to run a bot (or 7), to 7x 35 = 245mil /month + ~5mil per account (if lowballing) = 280mil/month.
I suggest using kminer if your p2p, but if you just really hate mining then your best bet would probably be botting nature runes. They are good money, and good for flipping if you have an extremely high quantity.